Safety



(No Model.) L. H. HEYNEMANN.

SAFETY APPLIANCE FOR. ELEVATORS.

Patented J an. 2, 1883.

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UNITED STATES 'ATENT FFICE.

LIONEL H. HEYNEMANN, OF SAN FRANCISCO, CALIFORNIA.

SAFETY APPLIANCE FOR ELEVATDRS.

SPECIFICATION forming part of Letters Patent No. 269,855, dated January 2, 1853.

Application filed June 25, 18H). (No model.) v

To all whom it may concern:

Be it known that l, LIONEL Hlinvwnrmnn, of the city and county of San Francisco, State of California, have invented a new and useful Improvement in Safety Appliances for Elevators, of which the following is a specification.

Nearly all safety appliances for elevators depend on springs held in place by the strain on vices supplied with centrifugal governors share this defect.

The object of my invention is to be perfectly independent of the cable, and to act immediately.

Similar letters of reference indicate corresponding parts. I

' Figure 1 shows a general view of the elevator with safety device attached. Fig. 2 shows a longitudinal section of the safety device. Fig. 3 shows a cross-section of gear-wheel; Fig. 4, a section of the valve.

A represents the ways upon which the carriage B moves up and down. To the ways are attached the rack O, .with which a sma l gearwheel, I), engages. This gear-wheel consists of several parts," (shown in Figs. 2 and 3:) an outside ring, a, with teeth, the center pin, 1), and the rollers 0. The center pin, 0. has noses cut on its surface. (Only shownin Fig. 2.) When the elevator ascends the teeth of the ring a engage in the rack O, and the ring a glides over the rollers c, that rest against the noses of the center pin without turning it. When it descends the ring a, revolving the opposite way, forces the rollers away from the noses and Wedges them in between the outer ring and the surfaces of the center pin, causingit to revolve. To this center pin is key ed an arm, E. To this arm is attached the piston-rod G of astnall cylinder, H. This cylinder is filled with any tluid-for instance, oil. The two ends of this cylinder are connected by achanncl, I.

The action of the device is as follows: When the elevator ascends the ring a revolves without bringing any other parts into operation. When it descends the center pin, 1), turnswith it the arm E, and the piston L forces the oil from one side of the piston through the channel I to the other side. The resistance thus offered to the piston is the essential part of my safety device. ried at will by the valve shown on a larger scale by Fig. 4. A sleeve,f, having an opening, g, on each side and an opening, 0, at the bottom on one side,is screwed into the cyliuderin such a manner that the openingsg form a continuation of the channel I. This sleeve contains a screw, m, under that a spring, 1, and below that a round stopper, h, turned smooth, so that it can glide up and down in the sleeve. This This resistance can be vastopper has an opening, is, and a small pimp,

screwed into its toot. Through the holes 1' oil is supplied from time to time to make up for leakage. These holes are stopped up by screws a. The object of this valve is to regulate the speed of the descending-elevator. The speed of the empty elevator is first regulated by turning the pin 1) fartherin or out of the stopper, so that the opening 7c is moved alittleiuto the sleeve, leaving as efl'ective opening only that portion of the opening in the stopper thatis below the top of the opening g. The spring Z keeps the pin 1) resting on the shells of the Y cylinder, leaving the greatest opening for the empty elevator. This being done, the valve requires no more attention. If the elevator is loaded, the greater pressure in the cylinder forces the stopper h up'hy pressing under it through the opening 0 in the sleeve and forces the stopper more into the sleeve, thus leaving less of the opening it effective. The rapidity of the descending elevator can therefore never become too great, for in that case the stopper would be pressed entirely into the sleeve, leav- -ing no opening at all for the oil, and bringing the elevator to a standstill.

This arrangementdocs away with the necessity of using brakes in connection with the hoisting machinery. In case loads are to be lifted the weight of which varies but little the cylinder needs neither channel I nor valve.

All that is necessary is to bore a few holes in the piston to establish the connection between both sides of the cylinder.

This device is not only applicable to cable elevators, but also to piston or telescoping tube elevators, and is also applicable to any kind of hoisting and elevating cars, such as inclined cable, rack-and -pinion, or frictionelutch railways.

\Vhat I clai|n as new and of my invention is I. In an elevator having the guides A and the vertically-moving cage 13, the cylinder H, attached to the cage, and having a passage connecting its opposite ends, in combination with the piston Lwithin the cylinder, the piston-rod G, and the pinion or other frictional contrivance constructed to engage a rack or other frictional surt'ace upon the side of the guides, substantially as herein described.

2. The combination, with an elevator-car and the rack (1, attached to the ways of the elevator, of the cog-wheel D, engaging with said rack, of the piston L, connected with said cogwheel D, and ot' a. cylinder, H, containing a liquid, and provided with an adjustable selfregulating valve, all substantially as herein shown and described, and for the purpose set forth.

3. The cylinder H, with its piston L, and the passage I, connecting its opposite ends, in combination with the valve h and the sleevef, intercepting the passage, and having the openings g, L, and 0, and the spring l, substantially as and for the purposes described.

4. The cylinder H, with its piston L, the passage I, connectingits opposite ends, and the automatic valve h, as shown, in combination with the regulating-screw p, substantially as herein described.

LIONEL H. HEYNEMANN.

W'itnesses:

ARTHUR ELoEssER, HERMANN HEYNEMANN. 

